[Fot] Restrictor Valve

[Tim Murphy]

Good point.  I had a discussion with Jack Drews regarding the seals from
Moss and he questioned whether or not they were the same "type" as the
original because they only seemed to last about one or maybe two seasons.
We've had the same problem.  I put stainless steel pistons in but we get the
seals "weeping" when the car stands for any amount of time, ultimately
draining all the brake fluid out, like over winter.  Under pressure they
seem to be sealing just fine, the level stays up in the reservoir during a
weekends event.  We may have to add some fluid due to pad wear (we have the
small style master on the front and back of a dual master system) during a
weekend but that's all.  I did notice some unusual "staining" on the
stainless pistons when we changed the seals last year.  Doesn't look like
actual scoring.  Anybody else seen this with the stainless pistons?  I can
e-mail photos, which don't really do a good job of showing what it looks
like, if anyone is interested.

Tim

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of jerryvv at roadrunner.com
Sent: Thursday, March 11, 2010 9:32 AM
To: Bob Kramer
Cc: fot at autox.team.net
Subject: Re: [Fot] Restrictor Valve

Bob, a bigger question is do we know that the current product is being
molded from the proper rubber compound. That certainly applies to many of
the rubber bits that are used in non-performance applications and I suspect
on some of our engine and transmission mounts that are now being made in
unknown foreign factories. 
Rubber compounds are designed for specific applications and heat and fluid
resistance are two of the most critical conditions that rubber development
is focused around. I believe Neoprene is the polymer of choice for brake
components however that's just a starting point. From there a specific
compound is developed using the base polymer. Once the compound is developed
testing is done to what's known as a Line Call out to certify that the
compound meets the design requirements.

I certainly hope that these rebuild kits are still being manufactured by
Girling or Lucas or some other reputable supplier. A no name box would give
me concern. I've seen a few of those with brake parts in them. Not to
mention the assumed liability.

JVV

---- Bob Kramer <rkramer3 at austin.rr.com> wrote: 
> I'd like to change the topic a little, to caliper seals and how long they 
> last under racing conditions. I just came back from a weekends racing and 
> rebuilt my calipers. The late TR4/early TR6 style calipers have one inner 
> ring and a rubber boot type seal. In mine the boots were crispy, crumbling

> to the touch and one of the 4 inner rings had heat damage. I can only
assume 
> that the little rubber seal between the halfs is also heat damaged. I had 
> spares ready so the job is done but I'm just a bit curious if everyone is 
> frying these like I am. Mine were on there for nearly 4 years of racing.
> 
> Bob Kramer
> Volente, TX
> 
> Perfection is not attainable, but if we chase perfection we can catch 
> excellence.
> Vince Lombardi
> ----- Original Message ----- 
> From: "MadMarx" <tr4racing at googlemail.com>
> To: "'Randall'" <tr3driver at ca.rr.com>
> Cc: <fot at autox.team.net>
> Sent: Thursday, March 11, 2010 2:19 AM
> Subject: Re: [Fot] Restrictor Valve
> 
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